CN113899465A - Optical fiber temperature-sensing fire detection device for fire fighting - Google Patents
Optical fiber temperature-sensing fire detection device for fire fighting Download PDFInfo
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- CN113899465A CN113899465A CN202111332328.XA CN202111332328A CN113899465A CN 113899465 A CN113899465 A CN 113899465A CN 202111332328 A CN202111332328 A CN 202111332328A CN 113899465 A CN113899465 A CN 113899465A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/08—Protective devices, e.g. casings
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
- G01K11/324—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres using Raman scattering
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B17/00—Fire alarms; Alarms responsive to explosion
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Abstract
The invention provides an optical fiber temperature-sensing fire detection device for fire fighting, which comprises: the temperature-sensitive optical fiber is arranged on a temperature detection occasion; the detector host is internally provided with a temperature resolving module, a laser and a detector; the laser is used for emitting laser signals to the inside of the temperature sensitive optical fiber; the detector is used for detecting and receiving the laser signals reflected by the temperature sensitive optical fiber and sending the laser signals to the temperature calculation module; the temperature calculating module is used for receiving the reflected laser signal transmitted by the detector and calculating the optical signal to obtain the position and the temperature of a temperature measuring point of the temperature sensitive optical fiber; and the upper computer is internally provided with a debugging module, is in communication connection with the detector host and is used for calibrating the optical fiber parameters of the temperature sensitive optical fiber. The device adopts a distributed measurement means, has a plurality of measurement point positions, and has the characteristics of real-time monitoring, high temperature precision, long measurement distance, accurate positioning, intrinsic safety and no electromagnetic interference.
Description
Technical Field
The invention belongs to the technical field of intelligent temperature detection, and particularly relates to an optical fiber temperature-sensing fire detection device for fire fighting.
Background
Among various disasters, the fire disaster is one of the main disasters which threaten public safety and social development most frequently and most generally, and poses serious threats to human production life and life safety, and the prevention of the fire disaster and the reduction of the harm of the fire disaster are very important for stable prosperity of the society. Therefore, we have deployed fire detectors on multiple occasions. The fire detector is a device for detecting the scene and finding out the fire in the fire-fighting automatic fire alarm system. Fire detectors are the "sense organs" of the system and function to monitor the environment for the presence or absence of a fire. Once a fire occurs, the characteristic physical quantities of the fire, such as temperature, smoke, gas, radiation intensity and the like, are converted into electric signals, and the electric signals immediately act to send alarm signals to a fire alarm controller, so that personnel can intervene in the fire in time.
But the arrangement of current fire detector needs the circular telegram, and the essence is not safe enough, and the restriction is more than many, for example in occasions such as tunnel, underground pipe gallery, flammable and explosive storage tank, some kinds of fire detector because the essence is safe enough, inconvenient the arranging, easily receive reasons such as electromagnetic interference and can't effectively arrange to current fire detector measuring point is not enough, and measurement accuracy is not accurate, and then can't in time handle the condition of a fire.
Disclosure of Invention
In view of the above-mentioned drawbacks and deficiencies of the prior art, the present invention is directed to an optical fiber temperature-sensitive fire detection device for fire protection.
In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
an optical fiber temperature-sensing fire detection device for fire protection, comprising: the temperature sensitive optical fiber is arranged on a temperature detection occasion; the detector host is internally provided with a temperature resolving module, a laser and a detector; the laser is connected with the temperature sensitive optical fiber and is used for emitting laser signals to the inside of the temperature sensitive optical fiber; one end of the detector is connected with the temperature sensitive optical fiber, and the other end of the detector is connected with the temperature calculating module and used for detecting and receiving the laser signal reflected by the temperature sensitive optical fiber and sending the laser signal to the temperature calculating module; the temperature calculating module is used for receiving the reflected optical signal transmitted by the detector and calculating the optical signal to obtain the position and the temperature of a temperature measuring point of the temperature sensitive optical fiber; and the upper computer is internally provided with a debugging module, is in communication connection with the detector host and is used for calibrating the optical fiber parameters of the temperature sensitive optical fiber.
According to the technical scheme provided by the embodiment of the application, the temperature calculating module comprises a light splitter, an optical filtering module, a photoelectric conversion module, an amplifying module, an analog-to-digital conversion module and a calculating module which are sequentially connected; the optical splitter is connected with the detector and used for distinguishing light with different frequencies in the laser signals to obtain first optical signals; the optical filtering module is used for respectively filtering the distinguished first optical signals to obtain second optical signals; the photoelectric conversion module is used for converting the second optical signal into a first electric signal; the amplifying module is used for amplifying the first electric signal to obtain an analog electric signal; the analog-to-digital conversion module is used for converting the analog electric signal into a digital electric signal; the resolving module is used for receiving and resolving the digital electric signal to obtain the position and the temperature of the temperature measuring point of the temperature sensitive optical fiber.
According to the technical scheme provided by the embodiment of the application, the temperature sensitive optical fiber is a multimode optical fiber.
According to the technical scheme provided by the embodiment of the application, the temperature-sensitive optical fiber is an armored optical fiber, and the armored optical fiber comprises: the stainless steel threaded pipe is sleeved on the outer layer of the optical fiber core of the temperature sensitive optical fiber; the Kevlar winding layer is sleeved on the outer layer of the stainless steel threaded pipe; and the stainless steel wire tight weaving layer is sleeved on the outer layer of the Kevlar winding layer.
According to the technical scheme provided by the embodiment of the application, the flame-retardant sheath is sleeved on the outer surface layer of the temperature-sensitive optical fiber and is made of rubber.
According to the technical scheme provided by the embodiment of the application, the casing of the detector host is made of metal, copper foil is filled in the gap of the casing made of metal, and the casing is connected with the circuit board inside the casing in an insulating mode.
According to the technical scheme that this application embodiment provided, the host computer is equipped with the RJ45 interface, the detector host computer is equipped with the RJ45 interface, two the RJ45 interface passes through communication line connection.
According to the technical scheme provided by the embodiment of the application, the upper computer is a notebook computer, a tablet computer, a desktop computer or an industrial touch screen computer.
The invention has the following beneficial effects:
because this device adopts temperature sensitive optic fibre as the terminal device of response and transmission temperature, need not circular telegram, compare with present fire detector terminal device and need circular telegram more, the essence is safer, is applicable to the operating mode that has the fire control requirement very much, can also real-time online continuous monitoring temperature, does not receive electromagnetic interference. The characteristics of the temperature sensitive optical fibers enable the device to measure and calculate the temperature on the whole temperature sensitive optical fiber, at least the temperature of each temperature sensitive optical fiber at the position of 0.2-0.5 meter away from each other, the specific distance is determined by the frequency of the detector, and further the temperature detection points of the device are distributed, the length of the optical fibers is long, so that the measurement distance is long, and the measurement points are many. The temperature sensitive optical fiber is arranged in temperature detection occasions such as tunnels, underground pipe galleries, flammable and explosive storage tanks and the like, and the arrangement is more convenient. Meanwhile, the device adopts a temperature-sensitive optical fiber distributed temperature sensing mode, and obtains space temperature distribution information by mainly utilizing a spontaneous Raman (Raman) scattering phenomenon and an Optical Time Domain Reflection (OTDR) principle generated during transmission in optical fibers, so that the temperature measurement precision is high, the measurement distance is long, and the positioning is accurate.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:
FIG. 1 is a block diagram of a fire detection device according to the present application;
FIG. 2 is a block diagram of a temperature calculation module according to the present application;
FIG. 3 is a flow chart of the temperature calculation module calculation process steps described in the present application;
FIG. 4 is a schematic cross-sectional view of a temperature sensitive optical fiber according to the present application;
fig. 5 is a schematic structural view of a fire detection device according to the present application.
Description of reference numerals:
1. an optical fiber core; 2. stainless steel threaded pipes; 3. a Kevlar wrap layer; 4. a stainless steel wire tight weaving layer; 5. a flame retardant jacket;
100. a temperature sensitive optical fiber; 200. a detector host; 300. and (4) an upper computer.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
An optical fiber temperature-sensing fire detection device for fire protection, comprising: at least one temperature-sensitive optical fiber 100, wherein the temperature-sensitive optical fiber 100 is arranged on a temperature detection occasion; the detector host 200 is internally provided with a temperature resolving module, a laser and a detector; the laser is connected with the temperature sensitive optical fiber and is used for emitting laser signals to the inside of the temperature sensitive optical fiber; one end of the detector is connected with the temperature sensitive optical fiber, and the other end of the detector is connected with the temperature calculating module and used for detecting and receiving optical signals reflected by the temperature sensitive optical fiber and sending the optical signals to the temperature calculating module; the temperature calculating module is used for receiving the reflected optical signal transmitted by the detector and calculating the optical signal to obtain the position and the temperature of a temperature measuring point of the temperature sensitive optical fiber; and the upper computer 300 is internally provided with a debugging module, is in communication connection with the detector host and is used for calibrating optical fiber parameters of the temperature sensitive optical fiber.
Referring to fig. 1 and 5 specifically, since the device uses the temperature sensitive optical fiber as a terminal device for sensing and transmitting temperature, it does not need to be powered on, and compared with the existing terminal device of fire detector, it is safer in nature, and is very suitable for industrial and mining with fire protection requirement, and it can monitor temperature continuously in real time on line without electromagnetic interference. The characteristics of the temperature sensitive optical fibers enable the device to measure and calculate the temperature on the whole temperature sensitive optical fiber, at least the temperature of each temperature sensitive optical fiber at the position of 0.2-0.5 meter away from each other, the specific distance is determined by the frequency of the detector, and further the temperature detection points of the device are distributed, the length of the optical fibers is long, so that the measurement distance is long, and the measurement points are many. The temperature sensitive optical fiber is arranged in temperature detection occasions such as tunnels, underground pipe galleries, flammable and explosive storage tanks and the like, and the arrangement is more convenient.
The temperature sensitive optical fiber is used for transmitting laser and is used as a terminal device for sensing temperature. The detector host is used for installing the laser, the detector and the temperature calculating module. The laser is used for emitting laser to the temperature sensitive optical fiber. The detector is used for receiving the laser reflected by the temperature-sensitive optical cable. The temperature calculating module is used for calculating the received laser. The detector host is mainly internally provided with demodulation software, a feedback device is not arranged in the detector host, the upper computer is generally a notebook computer, a tablet computer, a desktop computer or an industrial touch screen computer, and a debugging module is arranged in the upper computer. The debugging module of host computer is used for demarcating the optic fibre parameter of every temperature sensitive optic fibre, because the optic fibre parameter of every optic fibre is different, and the debugging module demarcates the optic fibre parameter and accomplishes measuring according to measuring the parameter modification of accuracy, is similar to the zero setting work before the electronic thermometer measured the temperature, can make the measuring result more accurate.
Meanwhile, the device adopts a temperature-sensitive optical fiber distributed temperature sensing mode, and obtains space temperature distribution information by mainly utilizing a spontaneous Raman (Raman) scattering phenomenon and an Optical Time Domain Reflection (OTDR) principle generated during transmission in optical fibers, so that the temperature measurement precision is high, the measurement distance is long, and the positioning is accurate.
Further, the temperature calculating module comprises a light splitter, an optical filtering module, a photoelectric conversion module, an amplifying module, an analog-to-digital conversion module and a calculating module which are connected in sequence; the optical splitter is connected with the detector and used for distinguishing light with different frequencies in the laser signals to obtain first optical signals; the optical filtering module is used for respectively filtering the distinguished first optical signals to obtain second optical signals; the photoelectric conversion module is used for converting the second optical signal into a first electric signal; the amplifying module is used for amplifying the first electric signal to obtain an analog electric signal; the analog-to-digital conversion module is used for converting the analog electric signal into a digital electric signal; the resolving module is used for receiving and resolving the digital electric signal to obtain the position and the temperature of the temperature measuring point of the temperature sensitive optical fiber.
A block diagram of a temperature calculation module according to the present application is shown in fig. 2. The laser generates a fiber Raman scattering phenomenon in the temperature sensitive fiber to generate light with two frequencies, Stokes (Stokes) light and AntiStokes (anti-Stokes) light, the temperature calculating module calculates the processing steps as shown in FIG. 3, and step S1, the laser signal distinguishes the Stokes light and the AntiStokes light after passing through the optical splitter module; step S2, the separated Stokes light and the AntiStokes light are respectively subjected to filtering, photoelectric conversion, amplification and analog-to-digital conversion in sequence to obtain digital electric signals; step S3, a calculating module calculates the ratio of the light intensity of Stokes light and AntiStokes light converted into digital electric signals to obtain the temperature value of the scattering area; step S4, calculating the echo time of the optical signal to obtain the position of the scattering region, i.e. the position of the temperature measurement point. The position of the temperature measuring point is determined based on an Optical Time Domain Reflection (OTDR) technology, and the position of the temperature measuring point of the temperature sensitive optical fiber corresponding to the scattering signal can be determined by measuring the echo time of the scattering signal by using a high-speed data acquisition card.
Because the device principle is to utilize the Raman scattering and optical time domain reflection principle generated when the light is transmitted in the optical fiber to obtain the spatial temperature distribution information. When laser pulse with certain energy and width is injected into the optical fiber, Raman scattering light waves are continuously generated while the laser pulse is transmitted in the optical fiber, the intensity of the Raman scattering light waves is related to the absolute temperature of the optical fiber, wherein the backward Raman scattering light waves are subjected to optical filtering, photoelectric conversion, amplification, analog-digital conversion and temperature demodulation of a temperature calculation module to obtain the position and the temperature of a temperature measuring point of the temperature sensitive optical fiber, and the temperature distribution on the whole optical fiber is displayed in real time by adopting a display of a detector host 200. Because the backscattered raman scattered light waves are very weak, the detector requires very high gain, high bandwidth, high sensitivity, and very low noise levels to detect; in addition, in order to achieve sufficient spatial positioning accuracy, the detector must have sufficient acquisition speed and a certain bandwidth.
Due to the influence of the loss and noise of the whole system, multiple measurements are needed, data are accumulated and averaged to obtain a real temperature curve which can better reflect a measured temperature field, and then the real temperature curve is transmitted to an upper computer to be stored in a database.
Raman scattering is associated with thermal vibration of the fiber molecules and is therefore sensitive to temperature and can be used for temperature measurement. Wherein the raman scattered light comprises light at two frequencies: stokes and anti Stokes, which are frequency distributed on both sides of the incident light frequency. The distribution of Stokes and AntiStokes scattered light over the spectrogram is approximately symmetrical, the AntiStokes scattered light is temperature sensitive and intensity modulated, while the Stokes scattered light is substantially temperature independent, and the ratio of the light intensities of the Stokes scattered light and the AntiStokes scattered light is dependent only on the temperature of the scattering region. The AntiStokes Raman scattering is used as a signal channel and is used as a main basis for calculating the temperature. And the Stokes Raman scattering is used as a reference channel to eliminate the influence of other factors such as noise. The temperature information of the scattering area can be demodulated by detecting and calculating the ratio of the light intensity of the light source to the light intensity of the light source, and the influences of instability of the light source, coupling loss, optical fiber joint loss, optical fiber bending loss, optical fiber transmission loss and the like in the optical fiber transmission process can be effectively eliminated.
The light with two different frequencies is separated by the light splitter and enters different light paths for processing. Since other scattered light and interference light are also included in the scattered light, it is necessary to perform certain bandpass filtering processing on the two lights. Obtaining the AntiStokes Raman scattered light with temperature information and the reference signal back scattered light. The backscattered light of the two channels is subjected to photoelectric conversion and amplification through respective APDs (avalanche photodiodes), and the acquired data is processed by data processing and display software to obtain the spatial distribution of the temperature and is displayed in a graph or table form.
Further, the temperature sensitive optical fiber 100 is a multimode optical fiber.
Specifically, the multimode optical fiber can transmit multi-band light, one optical fiber can transmit light emitted by the laser and reflected light, and the application range is wider.
Further, the temperature-sensitive optical fiber 100 is an armored optical fiber, and the armored optical fiber includes:
the stainless steel threaded pipe 2 is sleeved on the outer layer of the optical fiber core 1 of the temperature sensitive optical fiber;
the Kevlar winding layer 3 is sleeved on the outer layer of the stainless steel threaded pipe 2;
and the stainless steel wire tight weaving layer 4 is sleeved on the outer layer of the Kevlar winding layer 3.
Specifically, as shown in fig. 4. Because the optical fiber is composed of glass fiber and is fragile, the stainless steel threaded pipe 2, the Kevlar winding layer 3 and the stainless steel wire tight weaving layer 4 are sequentially arranged on the outer side of the optical fiber to form the armored optical fiber, so that the strength of the temperature-sensitive optical fiber is enhanced, the service life of the optical fiber is prolonged, and the service life can reach 30 years.
The stainless steel screwed pipe 2 is sleeved outside the optical fiber core with a fragile structure to reinforce the structure. The Kevlar fiber has permanent heat resistance, flame retardance, antistatic property, high strength and wear resistance, so that the armored optical cable structure is firmer and meets the use condition of a fire-fighting occasion. The stainless steel wire tight weaving layer is tightly woven by adopting the stainless steel wire, so that the optical fiber structure is further enhanced.
Further, a flame-retardant sheath is sleeved on the outer surface layer of the temperature-sensitive optical fiber 100, and the flame-retardant sheath is made of a rubber material.
Specifically, referring to fig. 4, the outermost layer of the temperature sensitive optical fiber 100 is provided with a flame retardant sheath for protection, so that the temperature sensitive optical fiber is not easy to burn and can meet the fire protection requirement.
Further, the casing of the detector host 200 is made of metal, copper foil is filled in the gap of the casing made of metal, and the casing is in insulation connection with the circuit board inside the casing.
Specifically, the copper foil is filled in the casing gap department of metal material, the casing is connected with the inside circuit board insulation of casing, casing ground connection is connected for the casing has the electromagnetic shield function, possesses electromagnetic compatibility, does not receive electromagnetic interference and can not influence others yet, can adapt to fire control application occasion.
Further, the upper computer 300 is provided with an RJ45 interface, the detector main unit 200 is provided with an RJ45 interface, and the two RJ45 interfaces are connected through a communication line.
Specifically, the data transmission quantity between the debugging module and the temperature calculating module of the RJ45 interface is larger, and the transmission is more stable.
Further, the upper computer 300 is a notebook computer, a tablet computer, a desktop computer, or an industrial touch screen computer.
Specifically, the upper computer 300 is a computer having an input/output feedback device and installed with debugging software, so as to perform debugging feedback on the probe host 200.
The foregoing description is only exemplary of the preferred embodiments of the invention and is illustrative of the principles of the technology employed. It will be appreciated by those skilled in the art that the scope of the invention herein disclosed is not limited to the particular combination of features described above, but also encompasses other arrangements formed by any combination of the above features or their equivalents without departing from the spirit of the invention. For example, the above features and (but not limited to) features having similar functions disclosed in the present invention are mutually replaced to form the technical solution.
Claims (8)
1. An optical fiber temperature-sensing fire detection device for fire protection, comprising:
the temperature-sensitive optical fiber (100) is arranged on a temperature detection occasion;
the detector host (200) is internally provided with a temperature resolving module, a laser and a detector; wherein the content of the first and second substances,
the laser is connected with the temperature sensitive optical fiber and is used for transmitting laser signals to the inside of the temperature sensitive optical fiber;
one end of the detector is connected with the temperature sensitive optical fiber, and the other end of the detector is connected with the temperature calculating module and used for detecting and receiving optical signals reflected by the temperature sensitive optical fiber and sending the optical signals to the temperature calculating module;
the temperature calculating module is used for receiving the reflected optical signal transmitted by the detector and calculating the optical signal to obtain the position and the temperature of a temperature measuring point of the temperature sensitive optical fiber;
and the upper computer (300) is internally provided with a debugging module, is in communication connection with the detector host and is used for calibrating the optical fiber parameters of the temperature sensitive optical fiber.
2. A fire-fighting optical fiber temperature-sensing fire detection device according to claim 1, wherein the temperature calculation module comprises a beam splitter, an optical filter module, a photoelectric conversion module, an amplification module, an analog-to-digital conversion module and a calculation module which are connected in sequence; the optical splitter is connected with the detector and used for distinguishing light with different frequencies in the laser signals to obtain first optical signals; the optical filtering module is used for respectively filtering the distinguished first optical signals to obtain second optical signals; the photoelectric conversion module is used for converting the second optical signal into a first electric signal; the amplifying module is used for amplifying the first electric signal to obtain an analog electric signal; the analog-to-digital conversion module is used for converting the analog electric signal into a digital electric signal; the resolving module is used for receiving and resolving the digital electric signal to obtain the position and the temperature of the temperature measuring point of the temperature sensitive optical fiber.
3. A fire-fighting optical fiber temperature-sensitive fire detection device according to claim 1, wherein the temperature-sensitive optical fiber (100) is a multimode optical fiber.
4. A fire-fighting optical fiber temperature-sensitive fire detection device according to claim 1, wherein the temperature-sensitive optical fiber (100) is an armored optical fiber, and the armored optical fiber includes:
the stainless steel threaded pipe (2) is sleeved on the outer layer of the optical fiber core (1) of the temperature sensitive optical fiber;
the Kevlar winding layer (3) is sleeved on the outer layer of the stainless steel threaded pipe (2);
and the stainless steel wire tight weaving layer (4) is sleeved on the outer layer of the Kevlar winding layer (3).
5. The optical fiber temperature-sensitive fire detection device for fire fighting as claimed in claim 1 or 4, wherein a flame-retardant sheath is sleeved on an outer surface layer of the temperature-sensitive optical fiber (100), and the flame-retardant sheath is made of rubber.
6. The optical fiber temperature-sensitive fire detector for fire fighting as claimed in claim 1, wherein the housing of the detector main unit (200) is made of metal, copper foil is filled in the gap of the metal housing, and the housing is connected with the circuit board inside the housing in an insulating manner.
7. A fire-fighting optical fiber temperature-sensing fire detection device as claimed in claim 1, wherein the upper computer (300) is provided with an RJ45 interface, the detector main unit (200) is provided with an RJ45 interface, and the two RJ45 interfaces are connected through a communication line.
8. A fire-fighting optical fiber temperature-sensitive fire detection device as claimed in claim 1, wherein the upper computer (300) is a notebook computer, a tablet computer, a desktop computer, or an industrial touch screen computer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111332328.XA CN113899465A (en) | 2021-11-11 | 2021-11-11 | Optical fiber temperature-sensing fire detection device for fire fighting |
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| CN202111332328.XA CN113899465A (en) | 2021-11-11 | 2021-11-11 | Optical fiber temperature-sensing fire detection device for fire fighting |
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Cited By (2)
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| CN117877234A (en) * | 2024-03-13 | 2024-04-12 | 青岛峻海物联科技有限公司 | Fire grading early warning method and system based on temperature sensing optical fiber and electronic equipment |
| CN117935464A (en) * | 2024-03-22 | 2024-04-26 | 青岛峻海物联科技有限公司 | Cloud-based fire intelligent alarm method and system and electronic equipment |
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